Plant Physiol. Drug Metab Dispos
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Plant Physiology 76:595-598 (1984)
© 1984 American Society of Plant Biologists

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Articles

Efficiency of Cold Hardiness Induction by Desiccation Stress in Four Winter Cereals 1

Yves Cloutier and Christopher J. Andrews

Chemistry and Biology Research Institute, Agriculture Canada, Research Branch, Ottawa, Ontario Canada K1A OC6

A number of defined desiccation treatments without low temperature exposure were able to induce freezing tolerance in 20 cultivars of winter cereals. A maximal degree of freezing tolerance was induced in epicotyls at 24°C in 24 hours at 40% relative humidity in rye and wheat, 7 days at 54% RH in barley, and 4 days at 70% RH in oats. Freezing tolerance was not correlated to water content of the plants after desiccation treatment but was related to the genetic capacity of the cultivars to frost harden. Levels of freezing tolerance induced by desiccation were similar to those induced by cold acclimation in rye and wheat, but considerably less in barley and oats. This is associated with a more rapid desiccation injury in barley and oats, precluding the completion of the hardening process.

1 Chemistry and Biology Research Institute Contribution No. 1447.




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Copyright © 1984 by the American Society of Plant Biologists